I'll be honest here that none of these reasons would be a 100% lock in for me if I was new to the franchise. I don't expect it to be for you either. But it does give us a few cool looks at some of the game play and settings in the game. While it is cool to be able to throw a rocket back at a helicopter it is by no means a "got to have it" selling point. If they had the "karate kick a helicopter" ability shown in here then we may be talking.
In all seriousness, make up your own decisions here. I just bring you the video clip so you can have a bit more of the inside of Prototype 2 before game launch next month. Just try to ignore the "buy me now" wrapper on the video and you'll be pleasantly surprised.